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最新的 9i DBA 1Z0-007 免費考試真題:

1. What does the FORCE option for creating a view do?

A) creates a view even if the underlying parent table has constraints
B) creates a view in another schema even if you don't have privileges
C) creates a view with constraints
D) creates a view regardless of whether or not the base tables exist

2. Which three statements about subqueries are true? (Choose three.)

A) A subquery can have more than one main query.
B) The subquery and main query can retrieve data from different tables.
C) Only one column or expression can be compared between the subquery and main query.
D) The subquery and main query must retrieve data from the same table.
E) A main query can have more than one subquery.
F) Multiple columns or expression can be compared between the subquery and main query.

3. Examine the data from the ORDERS and CUSTOMERS tables.

Evaluate the SQL statement:
SELECT * FROM orders WHERE cust_id = (SELECT cust_id FROM customers WHERE cust_name = 'Smith');
What is the result when the query is executed?

A) Option E
B) Option B
C) Option C
D) Option A
E) Option D

4. Examine the data from the EMP table:

The COMMISSION column shows the monthly commission earned by the employee.
Which three tasks would require subqueries or joins in order to perform in a single step? (Choose three)

A) Creating a table called COMMISSION that has the same structure and data as the columns EMP_ID and COMMISSIONS of the EMP table.
B) Decreasing the commission by 150 for the employees who are working in department 30 and earning a commission of more then 800.
C) Finding the number of employees who do NOT earn commission and are working for department 20.
D) Deleting the records of employees who do not earn commission.
E) Increasing the commission of employee 3 by the average commission earned in department 20.
F) Inserting into the table a new employee 10 who works for department 20 and earns a commission that is equal to the commission earned by employee 3.

5. Mary has a view called EMP_DEPT_LOC_VU that was created based on the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables. She granted SELECT privilege to Scott on this view.
Which option enables Scott to eliminate the need to qualify the view with the name MARY .EMP_DEP_LOC_VU each time the view is referenced?

A) Scott cannot create any synonym for Mary's view. Mary should create a private synonym
for the view and grant SELECT privilege on that synonym to Scott.
B) Scott can create a synonym for the EMP_DEPT_LOC_VU bus using the command:
CREATE PRIVATE SYNONYM EDL_VU
FOR mary.EMP DEPT_LOC_VU;
then he can prefix the columns with this synonymn.
C) Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command:
CREATE SYNONYM EDL_VU
FOR mary.EMP_DEPT_LOC_VU;
then he can prefix the columns with this synonym.
D) Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command:
CREATE SYNONYM EDL_VU
ON mary(EMP_DEPT_LOC_VU);
then he can prefix the columns with this synonym.
E) Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command:
CREATE LOCAL SYNONYM EDL_VU
FOR mary.EMP DEPT_LOC_VU;
then he can prefix the columns with this synonym.
F) Scott cannot create a synonym because synonyms can be created only for tables.

問題與答案：